feat: drop python3.13t (#2684)

* break: remove cp313t

* break: drop unused cpython-freethreading enable option

* update message

unit_test/options_test.py

@@ -18,7 +18,6 @@ from cibuildwheel.options import (
     _get_pinned_container_images,
 )
 from cibuildwheel.platforms import ALL_PLATFORM_MODULES, get_build_identifiers
-from cibuildwheel.selector import EnableGroup
 from cibuildwheel.util import resources
 from cibuildwheel.util.packaging import DependencyConstraints
 
@@ -446,50 +445,6 @@ def test_override_inherit_environment_with_references(tmp_path: Path) -> None:
     }
 
 
-@pytest.mark.parametrize(
-    ("toml_assignment", "env", "enable_args", "expected_result"),
-    [
-        ("", {}, [], False),
-        ("enable = ['cpython-freethreading']", {}, [], True),
-        ("enable = []", {}, [], False),
-        ("", {}, ["cpython-freethreading"], True),
-        ("", {}, ["cpython-freethreading", "pypy"], True),
-        ("", {"CIBW_ENABLE": "pypy"}, [], False),
-        ("", {"CIBW_ENABLE": "cpython-freethreading"}, [], True),
-        ("enable = []", {"CIBW_ENABLE": "cpython-freethreading"}, [], True),
-        ("enable = ['cpython-freethreading']", {"CIBW_ENABLE": "pypy"}, [], True),
-        ("enable = ['cpython-freethreading']", {}, ["pypy"], True),
-        ("enable = ['cpython-freethreading']", {"CIBW_ENABLE": ""}, [], True),
-        ("enable = []", {"CIBW_ENABLE": ""}, [], False),
-    ],
-)
-def test_free_threaded_support(
-    tmp_path: Path,
-    toml_assignment: str,
-    env: dict[str, str],
-    enable_args: list[str],
-    expected_result: bool,
-) -> None:
-    args = CommandLineArguments.defaults()
-    args.package_dir = tmp_path
-    args.enable = enable_args
-
-    pyproject_toml: Path = tmp_path / "pyproject.toml"
-    pyproject_toml.write_text(
-        textwrap.dedent(
-            f"""\
-            [tool.cibuildwheel]
-            {toml_assignment}
-            """
-        )
-    )
-    options = Options(platform="linux", command_line_arguments=args, env=env)
-    if expected_result:
-        assert EnableGroup.CPythonFreeThreading in options.globals.build_selector.enable
-    else:
-        assert EnableGroup.CPythonFreeThreading not in options.globals.build_selector.enable
-
-
 @pytest.mark.parametrize(
     ("toml_assignment", "base_file_path", "packages"),
     [